DAVID HAY JONES / SCIENCE PHOTO LIBRARY DAVID HAY JONES / SCIENCE PHOTO LIBRARY
Bus driving past a US flag. The bus is part of a public transport system. Public transport systems can help reduce urban traffic congestion and pollution. This is the Milwaukee County Transit System, in Wisconsin, USA. The system has dozens of routes and is used by millions of people. It is one of the largest public bus systems in the USA. Photographed in 2003.
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